[GFI] Custom Tracking Numbers

[roncodes]

Description:
Allow users to define and assign custom tracking numbers for orders and other entities.

Tasks:

• Ensure support for manual or auto-generated tracking numbers.
• Ensure uniqueness within the company scope.
• Display custom tracking numbers in order and entity listings.

Acceptance Criteria:

• Users can set or override tracking numbers.
• Tracking numbers are unique and searchable.
• Tracking numbers show in detail and label views.

References:

• Related models: Order, Entity.
• See HasTrackingNumber trait